Weak Expectations and Nuclear C-Algebras Bruce Blackadar Indiana University Mathematics Journal 1978 text pdf 10.1512/iumj.1978.27.27070 10.1512/iumj.1978.27.27070 en Indiana Univ. Math. J. 27 (1978) 1021 - 1026 state-of-the-art mathematics http://iumj.org/access/